package com.usian.service.impl;

import com.github.pagehelper.PageHelper;
import com.usian.JsonUtils;
import com.usian.mapper.SearchItemMapper;
import com.usian.pojo.SearchItem;
import com.usian.service.SearchService;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.action.admin.indices.get.GetIndexRequest;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.IndicesClient;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@Service
@Transactional
public class SearchServiceImpl implements SearchService {

    @Autowired
    private SearchItemMapper searchItemMapper;

//    索引名称
    @Value("${ES_INDEX_NAME}")
    private String ES_INDEX_NAME;

//    类型名称
    @Value("${ES_TYPE_NAME}")
    private String ES_TYPE_NAME;

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    @Override
    public boolean importAll() {
        try {
//        1:查数据库
            List<SearchItem> searchItemList = searchItemMapper.getItemList();
//        2：建索引库
            if (!isExistsIndex()) {
                createIndex();
            }
//        3：循环添加  bulk
            int page = 1;
            while (true){
                /**分页每次导入一千条*/
                PageHelper.startPage(page,1000);
                //1、查询mysql中的商品信息
                List<SearchItem> esDocumentList = searchItemMapper.getItemList();
                if(esDocumentList==null || esDocumentList.size()==0){
                    break;
                }
                BulkRequest bulkRequest = new BulkRequest();
                for (int i = 0; i < esDocumentList.size(); i++) {
                    SearchItem searchItem =  esDocumentList.get(i);
                    //2、把商品信息添加到es中
                    bulkRequest.add(new IndexRequest(ES_INDEX_NAME, ES_TYPE_NAME).
                            source(JsonUtils.objectToJson(searchItem), XContentType.JSON));
                }
                restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
                page++;
            }
            return true;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public List<SearchItem> list(String q, Long page, Long pageSize) {
        try {
//        1:es  api
            SearchRequest searchRequest = new SearchRequest(ES_INDEX_NAME);
            searchRequest.types(ES_TYPE_NAME);
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            searchSourceBuilder.query(QueryBuilders.multiMatchQuery(q,"item_title","item_desc","item_sell_point","item_category_name"));

//            页码
            Long from = (page-1)*pageSize;
            searchSourceBuilder.from(from.intValue());
            searchSourceBuilder.size(pageSize.intValue());

//            封装查询条件
            searchRequest.source(searchSourceBuilder);
            SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
//            遍历结果封装List<SearchItem>
            SearchHit[] searchHits = searchResponse.getHits().getHits();
            ArrayList<SearchItem> searchItemArrayList = new ArrayList<>();
            for (SearchHit searchHit : searchHits) {
                searchItemArrayList.add(JsonUtils.jsonToPojo(searchHit.getSourceAsString(),SearchItem.class));
            }
            return searchItemArrayList;
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }

        return null;
    }

    @Override
    public int insertDocument(String msg) {
        try {
//        msg   skuId  去mysql查询数据  格式成es库那些字段
            SearchItem searchItem = searchItemMapper.getItemById(Long.valueOf(msg));
//        更新es库
            IndexRequest indexRequest = new IndexRequest(ES_INDEX_NAME, ES_TYPE_NAME);
            indexRequest.source(JsonUtils.objectToJson(searchItem),XContentType.JSON);
            IndexResponse indexResponse = restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
            return indexResponse.getShardInfo().getFailed();
        } catch (NumberFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return 0;
    }

    /**
     * 索引库是否存在  true  存在  false  不存在
     *
     * @return
     * @throws IOException
     */
    private boolean isExistsIndex()throws IOException{
        GetIndexRequest getIndexRequest = new GetIndexRequest();
        getIndexRequest.indices(ES_INDEX_NAME);
        return restHighLevelClient.indices().exists(getIndexRequest,RequestOptions.DEFAULT);
    }

    /**
     * 创建索引库
     *
     * @return
     * @throws IOException
     */
    private boolean createIndex() throws IOException {
        //创建索引请求对象，并设置索引名称
        CreateIndexRequest createIndexRequest = new CreateIndexRequest(ES_INDEX_NAME);
        //设置索引参数
        createIndexRequest.settings(Settings.builder().put("number_of_shards",2)
                .put("number_of_replicas",1));
        createIndexRequest.mapping(ES_TYPE_NAME, "{\n" +
                "  \"_source\": {\n" +
                "    \"excludes\": [\n" +
                "      \"item_desc\"\n" +
                "    ]\n" +
                "  },\n" +
                "  \"properties\": {\n" +
                "    \"item_title\": {\n" +
                "      \"type\": \"text\",\n" +
                "      \"analyzer\": \"ik_max_word\",\n" +
                "      \"search_analyzer\": \"ik_smart\"\n" +
                "    },\n" +
                "    \"item_sell_point\": {\n" +
                "      \"type\": \"text\",\n" +
                "      \"analyzer\": \"ik_max_word\",\n" +
                "      \"search_analyzer\": \"ik_smart\"\n" +
                "    },\n" +
                "    \"item_price\": {\n" +
                "      \"type\": \"float\"\n" +
                "    },\n" +
                "    \"item_image\": {\n" +
                "      \"type\": \"text\",\n" +
                "      \"index\": false\n" +
                "    },\n" +
                "    \"item_category_name\": {\n" +
                "      \"type\": \"keyword\"\n" +
                "    },\n" +
                "    \"item_desc\": {\n" +
                "      \"type\": \"text\",\n" +
                "      \"analyzer\": \"ik_max_word\",\n" +
                "      \"search_analyzer\": \"ik_smart\"\n" +
                "    }\n" +
                "  }\n" +
                "}", XContentType.JSON);
        //创建索引操作客户端
        IndicesClient indices = restHighLevelClient.indices();

        //创建响应对象
        CreateIndexResponse createIndexResponse =
                indices.create(createIndexRequest, RequestOptions.DEFAULT);
        //得到响应结果    true  成功   false  失败
        return createIndexResponse.isAcknowledged();
    }
}
